无法从 AWS Neptune 检索数据

如何解决无法从 AWS Neptune 检索数据

我创建了一个 AWS Appsync graphql api，它在被调用时将运行 aws lambda 函数，该函数将使用查询语言 Gremlin 从 AWS Neptune 查询数据，但我无法从 aws neptune 检索数据。

这是我的 lambda 函数

// import * as gremlin from "gremlin";
const gremlin = require("gremlin")

const DriverRemoteConnection = gremlin.driver.DriverRemoteConnection;
const Graph = gremlin.structure.Graph;
const uri = process.env.READER_ENDPOINT


const HighestRatedByCuisine = async () => {

    let dc = new DriverRemoteConnection(`wss://${uri}/gremlin`,{});
    const graph = new Graph();
    const g = graph.traversal().withRemote(dc)

    try {
        let data = await g.V().has("Person","name","Muhammad Ahsen Riaz").
            out("lives").in_("within").where(__.out("serves").
                has("name",P.within("Burgers"))).
            where(__.inE("about")).
            group().
            by(__.identity()).
            by(__.in_("about").values("rating")).
            order().
            by(values,Order.desc).
            unfold().
            order().by(values,Order.desc).limit(1).
            project("name","address","rating_average","cuisine").
            by(__.select(Column.keys).values("name")).
            by(__.select(Column.keys).values("address")).
            by(__.select(Column.values)).
            by(__.select(Column.keys).out("serves").values("name")).next()

            console.log("Onlydata",data)
            console.log("Data>>>",data.value)
            console.log("data>>>>>",data.done)
            console.log("JsonData",JSON.stringify(data))


        return data.value
     
    }

    catch (err) {
        console.log("there is an error ",err)
        return err
    };

}

export default HighestRatedByCuisine

这是我的架构

type HighestRatedRestaurantWithSpecificCuisine {
    name : String
    address : String
    cuisine : String
    rating_average : String
}

type Query {
 getHighestRatedRestaurantWithSpecificCuisine : HighestRatedRestaurantWithSpecificCuisine
}

每当通过 appsync 进行查询时，它都会返回 null，但是当我在 AWS CloudWatch 中对其进行控制台时，它包含表单中的数据

    Data>>> Map {
  'name' => 'Burger Lab','address' => '3648 Alek Forge','rating_average' => '4','cuisine' => 'Burgers' }